On the stereochemistry of valence bonds and the structures of XeO3, XeF4 and XeF2

Andersson, S.

doi:10.1107/s0567740879006361

Cited by 21 publications

(12 citation statements)

References 6 publications

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“…To determine the geometry of compounds whose lone pair component can cause significant distortion, VESPR theory is usually invoked, and it predicts that the lone pair of electrons should be situated where the Pb−S bonds are longest and the S−Pb−S bond angle is larger than expected, while the S−Pb−S angle on the opposite side of the lone pair should be smaller than predicted. Another method proposed by Andersson uses the volume occupied by the lone pair to locate its position in the complex since the Pb−lone pair interaction is shorter than a Pb−S bonding interaction and the Pb is forced off center in a regular polyhedron. The geometry so far described in our compound is in keeping with the metallic lone pair located on the apical part of the pyramid, opposite the S atoms and stereochemically active.…”

Section: Resultsmentioning

confidence: 99%

A Short Pb···Pb Separation in the Polymeric Compound Bis(pyrrolidinecarbodithioato)lead(II) and a Conformational Pathway Interconversion for the “Pb^IIS₄” Framework

1997

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The X-ray structure of bis(pyrrolidinecarbodithioato)lead(II), Pb(II)(pdtc)(2), C(10)H(16)N(2)S(4)Pb, shows the metal to be on a crystallographic 2-fold axis. The primary Pb-S bonds are equal, 2.89 Å; this is a unique feature of this compound compared to other Pb(II) dithiocarbamate structures. The crystal structure consists of polymeric Pb(pdtc)(2) units stacked along the c axis in two antiparallel columns; successive Pb(pdtc)(2) units are staggered. There are weaker Pb-S bonding interactions with the unit above (secondary Pb-S bonds) such that the coordination polyhedron formed by the eight S atoms bound to the Pb atom is a distorted square antiprism. Successive antiprisms share the pyramidal base, and the Pb.Pb distance between neighboring Pb(pdtc)(2) units is 3.886(1) Å. We analyze the structures of other PbS(4) compounds and find that the Pb lone pair is important in defining their geometry. The large variety of Pb configurations results from peripheral changes in the ligand. This is due to a compromise between the efficient use of space in the crystal and the tendency of lead to have different coordination numbers. These configurations can be described by a pathway of conformational interconversion from a 4-sided pyramidal geometry to an octahedral system. The title compound crystallizes in the orthorhombic space group Pccn with z = 4; cell constants are a = 13.839(14) Å, b = 14.058(16) Å, c = 7.763(6) Å.

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Section: Resultsmentioning

confidence: 99%

A Short Pb···Pb Separation in the Polymeric Compound Bis(pyrrolidinecarbodithioato)lead(II) and a Conformational Pathway Interconversion for the “Pb^IIS₄” Framework

1997

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“…Local atomic distribution which corresponds to these displacements, it is possible to interpret as existence of defect tetrahedrons V (t) 4 in a disordered vanadium monoxide [36]. Strong diffraction evidence for the existence of tetrahedral defect clusters in disordered VO 1.23 was presented by Andersson et al [13].…”

Section: Atommentioning

confidence: 95%

“…The vanadium monoxide VO y is stated by the authors [22,23] to have the structure of type B1, but this conclusion has been made without detailed crystallographic analysis by analogy to cubic titanium monoxide TiO y . In the subsequent investigations [32][33][34][35][36][37][38]38], the vanadium atoms occupying tetrahedral positions 8(c), which are unusual for the B1-type crystal structure, were found in a lattice of a disordered VO y vanadium monoxide. One might think that a disordered VO y ≡V x O z vanadium monoxide has a cubic (space group Fm3m) crystal structure D0 3 -type with partial filling of positions 8(c) by V atoms in all homogeneity interval.…”

Section: Atommentioning

confidence: 98%

Vacancy distribution in nonstoichiometric vanadium monoxide

Гусев

Давыдов

Валеева

2011

Journal of Alloys and Compounds

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“…The crystal structure of XeF 2 is tetragonal, with lattice parameters aϭ4.315 and cϭ6.990 Å. 10,11 The molecules are aligned along the c axis ͑Fig. 2͒.…”

Section: B Structure Of Xefmentioning

confidence: 99%

Etching of Si through a thick condensed XeF2 layer

Sebel

Hermans

Beijerinck

2000

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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On the stereochemistry of valence bonds and the structures of XeO₃, XeF₄ and XeF₂

Cited by 21 publications

References 6 publications

A Short Pb···Pb Separation in the Polymeric Compound Bis(pyrrolidinecarbodithioato)lead(II) and a Conformational Pathway Interconversion for the “Pb^IIS₄” Framework

A Short Pb···Pb Separation in the Polymeric Compound Bis(pyrrolidinecarbodithioato)lead(II) and a Conformational Pathway Interconversion for the “Pb^IIS₄” Framework

Vacancy distribution in nonstoichiometric vanadium monoxide

Etching of Si through a thick condensed XeF2 layer

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On the stereochemistry of valence bonds and the structures of XeO3, XeF4 and XeF2

Cited by 21 publications

References 6 publications

A Short Pb···Pb Separation in the Polymeric Compound Bis(pyrrolidinecarbodithioato)lead(II) and a Conformational Pathway Interconversion for the “PbIIS4” Framework

A Short Pb···Pb Separation in the Polymeric Compound Bis(pyrrolidinecarbodithioato)lead(II) and a Conformational Pathway Interconversion for the “PbIIS4” Framework

Vacancy distribution in nonstoichiometric vanadium monoxide

Etching of Si through a thick condensed XeF2 layer

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Product

Resources

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On the stereochemistry of valence bonds and the structures of XeO₃, XeF₄ and XeF₂

A Short Pb···Pb Separation in the Polymeric Compound Bis(pyrrolidinecarbodithioato)lead(II) and a Conformational Pathway Interconversion for the “Pb^IIS₄” Framework

A Short Pb···Pb Separation in the Polymeric Compound Bis(pyrrolidinecarbodithioato)lead(II) and a Conformational Pathway Interconversion for the “Pb^IIS₄” Framework